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Effect of Non-Metallic Inclusions and Hot Rolling Process Parameters on Hydrogen Induced Cracking of Linepipe Steels  

Koh, Seong Ung (Plate Research Group, Technical Research Lab., POSCO)
Jung, Hwan Gyo (Plate Research Group, Technical Research Lab., POSCO)
Kang, Ki Bong (Plate Research Group, Technical Research Lab., POSCO)
Publication Information
Korean Journal of Metals and Materials / v.46, no.4, 2008 , pp. 257-266 More about this Journal
Abstract
AHydrogen induced cracking (HIC) was phenomenologically studied in terms of the effect of nonmetallic inclusions and hot rolling process parameters. By comparing the level of non-metallic inclusions in two different kinds of commercial grade steels having different HIC resistance, the role of non-metallic inclusions in HIC occurrence was investigated. Change in inclusion morphology and distribution during hot rolling was also studied throughout slab, rolling at austenite recrystallization region (roughing mill; RM) and rolling at austenite non-recrystallization region (finish mill; FM). In addition, the contribution of RM and FM parameters to HIC was investigated from the standpoint of change in inclusion morphology during hot rolling processes. As a result, HIC was closely related to the separation of large complex inclusion during hot rolling process. Large complex inclusions originated from the improper Ca treatment, after which equilibrium composition of slag should have resulted in eutectoid composition. By controlling the equilibrium slag composition equivalent to eutectoid one, HIC resistance could be improved due to the reduced size of inclusions. In addition, change in reduction/pass in RM had an effect on HIC resistance of steels while that in FM did not. Increase in the reduction/pass in the latter stage of RM improved HIC resistance of steels by enhancing the void enclosure around inclusions.
Keywords
Linepipe steel; hsla steel; hydrogen induced cracking (HIC); inclusion; hot rolling;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
Times Cited By Web Of Science : 2  (Related Records In Web of Science)
Times Cited By SCOPUS : 2
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